What is the best way to create pcolor plot in the case when 1d-arrays given?

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Attskij Sotona 2020-3-3

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评论： Attskij Sotona 2020-3-7

采纳的回答： Walter Roberson

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Hello community. Could you provide an example for pcolor plot, if my dataset is described like this:

x=getSomeX(); % returns 1-by-n vector, in general just random doubles without any sequence
y=getSomeY(x); % returns 1-by-n vector
z=getSomeZ(x); % returns 1-by-n vector

where n is constant length, and i want to do something like this

pcolor(x,y,z);

but for me the problem is to make a correct n-by-n matrix z.

Thanks!

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Walter Roberson 2020-3-4

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You cannot directly create pcolor plots in that situation. Instead see griddedInterpolant() https://www.mathworks.com/help/matlab/ref/griddedinterpolant.html or scatteredInterpolant() . Once you have the interpolated data, you can pcolor() that.

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Walter Roberson 2020-3-6

Then use scatteredInterpolant instead of griddedInterpolant.

Attskij Sotona 2020-3-7

在 MATLAB Online 中打开

scatteredInterpolant is OK, found an example here

https://blogs.mathworks.com/graphics/2016/02/24/on-the-grid/

npts = 250;
rng default
x = 2*randn(npts,1);
y = 2*randn(npts,1);
v = sin(x) .* sin(y);
figure; scatter(x,y,36,v,'filled')
colorbar
xlim([-2*pi 2*pi])
ylim([-2*pi 2*pi])
[xg,yg] = meshgrid(linspace(-2*pi,2*pi,125));
F = scatteredInterpolant(x,y,v);
vg = F(xg,yg);
figure; pcolor(xg,yg,vg);
shading flat;